package leetcode;

import java.util.HashMap;

public class TwoSum {
    public int[] twoSum(int[] nums, int target) {
        HashMap<Integer, Integer> map = new HashMap<>();
        for (int i = 0; i<nums.length; i++){
            if (map.containsKey(target-nums[i])){
                return new int[]{map.get(target-nums[i]),i};
            }
            map.put(nums[i],i);
        }throw new IllegalArgumentException("没有两数之和");
    }

}
